The same guys who wear wireless headsets. I mean, Soldier’s visor and gun could also be linked via cable, but that would be way~ too impractical, right? You also want an easy way to be updated about ammo etc., right?

Symmetra’s turrets, too. Sombra just turns them to face her, then goes off to overturn the MEKA, remove everyone’s masks, and picks up Torbjorn’s turret as a new weapon. Everyone knows it’s her, but somehow I don’t think she really cares.

Limbs can be cybernetically enhanced. Thus, McCree’s legs are modified in some form.
Roadhog’s hook might have a small motor to reel it in fast, and OOPS that’s hackable.
Seems even Hanzo’s bow is motorized in some fashion, if it’s turned off too.